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The Spinning Magnet: Earth's Invisible Life-Support System

Alanna Mitchell discusses her thoroughly-researched and highly-engaging book on the science of electromagnetism, how the earth's magnetic force may be decaying faster than first thought, and what that may mean for animals and humans alike.

Alanna Mitchell is an award-winning science journalist and author of "Sea Sick- The Global Ocean in Crisis," which won the Grantham Prize for environmental journalism. She 's written for the New York Times, National Geographic and the Guardian....